<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>jQuery 版“元素拖拽改变大小”原型 </title>
<script type="text/javascript" src="jquery-1.11.0.min.js"></script>
<script type="text/javascript">
    $(function(){
        //绑定需要拖拽改变大小的元素对象
        bindResize(document.getElementById('test'));
    });

    function bindResize(el){
        //初始化参数 鼠标的 X 和 Y 轴坐标
        var els = el.style, x = y = 0;
        console.log(els);
        //邪恶的食指
        $(el).mousedown(function(e){
            //按下元素后，计算当前鼠标与对象计算后的坐标
            x = e.clientX - el.offsetWidth,
            y = e.clientY - el.offsetHeight;
            //在支持 setCapture 做些东东
            el.setCapture ? (
                //捕捉焦点
                el.setCapture(),
                //设置事件
                el.onmousemove = function(ev){
                    mouseMove(ev || event)
                },
                el.onmouseup = mouseUp
            ) : (
                //绑定事件
                $(document).bind("mousemove",mouseMove).bind("mouseup",mouseUp)
            )
            //防止默认事件发生
            e.preventDefault()
        });
        //移动事件
        function mouseMove(e){
            //宇宙超级无敌运算中...
            els.width = e.clientX - x + 'px',
            els.height = e.clientY - y + 'px'
        }
        //停止事件
        function mouseUp(){
            //在支持 releaseCapture 做些东东
            el.releaseCapture ? (
                //释放焦点
                el.releaseCapture(),
                //移除事件
                el.onmousemove = el.onmouseup = null
            ) : (
                //卸载事件
                $(document).unbind("mousemove", mouseMove).unbind("mouseup", mouseUp)
            )
        }
    }
</script>
<style type="text/css">
#test{
    position:absolute;
    top:0;left:0;
    width:200px;
    height:100px;
    background:#f1f1f1;
    text-align:center;
    line-height:100px;
    border:1px solid #CCC;
    cursor:move;
}
</style>
</head>

<body>
    <div id="test">dgdg</div>
</body>
</html>
